JPH06232529A - Cutoff method of flexible printed board sheet - Google Patents

Abstract

PURPOSE:To enable a flexible printed board sheet to be accurately separated into unit flexible boards by cutting by a method wherein either of two pressing members fixed to the upside and underside of the flexible printed board sheet is pressed along the cut surface of the printed board. CONSTITUTION:A copper foil 6 is pasted on a base film with adhesive agent, a pattern, wherein a copper foil 6a whose ends are located along a separating.cutting line K adjacent to the bases of connections 2a, 2b, and 2c is left and remains is formed on the copper foil 6 besides a circuit pattern, and a cover film is pasted on the copper foil 6 on which the circuit pattern and the separating.cutting copper foil 6a are formed for the formation of a flexible printed board sheet 3. When the flexible printed board sheet 3 is divided into separate flexible printed boards 1 by cutting, pressing members are made to abut against the upside and underside of the flexible board sheet 3 along the separating-cutting line K, either of the pressing members is fixed, and the other pressing member is pressed from above or below to divide the board sheet 3 into the boards 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for separating and cutting a flexible printed circuit board sheet used for producing electronic equipment.

[0002]

2. Description of the Related Art In recent years, the miniaturization of electronic equipment has been remarkably advanced, and the production of electronic equipment using a flexible printed circuit board is rapidly increasing.

Japanese Utility Model Application Laid-Open No. 55-14716 discloses a technique in which a low-capacity capacitor is composed of a thin, lightweight, and flexible printed circuit board, which is suitable for an electronic compact desktop computer. There is.

Generally, when manufacturing a flexible printed circuit board, the flexible printed circuit board is manufactured as follows in order to efficiently mount an electronic component such as an IC chip on the flexible printed circuit board. That is, as shown in FIG. 5, the flexible printed circuit board 51 has a plurality of connecting parts 52a, 5 which are formed by stamping a master plate.
A circuit pattern is formed in a broken line P on a copper foil (not shown) adhered with an adhesive on a base film connected by 2b and 52c, and a cover film (not shown) is formed on the circuit pattern with an adhesive. A flexible printed circuit board sheet 53 to which is adhered is created. Then, when the flexible printed circuit board 51 is incorporated into the electronic device, the flexible printed circuit board 51 is manufactured by separating and cutting the connecting portions 52a, 52b, 52c of the flexible printed circuit board sheet 53.

At this time, in the conventional technique, as shown in FIG. 7, the upper blade 54 and the lower blade 55 are brought into contact with the upper surface 56 and the lower surface 57 of the flexible printed circuit board sheet 53 along the separation cutting line K to press and cut. Was. Accordingly, when the circuit pattern is formed on the flexible printed circuit board sheet 53, the base film 58 of the connecting portions 52a, 52b, 52c from which the copper foil is removed and the adhesive 59 on the base film 58.
The cover film 60 adhered by is cut along the separation cutting line K.

[0006]

However, in the process of cutting the flexible printed circuit board sheet 53, variations in the work of the operator, variations in the dimensions of the flexible printed circuit board sheet 53, variations in the flexibility of the flexible printed circuit board sheet 53, etc. Therefore, it is difficult to accurately position the flexible printed board sheet 53 with respect to the cutter (upper blade 54, lower blade 55). Therefore, as shown in FIG. 6, the connecting portions 52a, 52b, and 52c remain in many of the flexible printed circuit boards 51 after the flexible printed circuit board sheet 53 is separated and cut, and there is a problem that the flexible printed circuit board 51 cannot be incorporated into an electronic device. It was That is, the design shape of the flexible printed circuit board 51 is the shape shown in FIG. 5, and the rest of the connecting portions 52a, 52b, 52c becomes an obstacle when incorporated in an electronic device.

The present invention solves such a conventional problem, and provides a method of separating and cutting a flexible printed circuit board sheet, which can accurately separate and cut each flexible printed circuit board from one flexible printed circuit board sheet. The purpose is to

[0008]

In order to achieve the above object, the method for separating and cutting a flexible printed circuit board sheet according to the present invention comprises a copper foil adhered on a base film with an adhesive, a connecting portion in addition to a circuit pattern. A pattern is formed by leaving a copper foil for separation and cutting, the end of which is located along the separation and cutting line near the base of, and is covered with an adhesive on the copper foil on which the circuit pattern and the pattern for separation and cutting are formed. The upper surface pressing member and the lower surface pressing member are respectively brought into contact with the upper surface and the lower surface of the flexible printed circuit board sheet along the separation cutting line of the flexible printed circuit board sheet formed by attaching a film, and one of the pressing members is fixed. The other pressing member is pressed from above or below to separate and cut.

[0009]

According to the above method, since the copper foil for separating and cutting whose end is located along the separation cutting line near the base of the connecting portion is left, the copper foil of the flexible printed circuit board sheet is left. Since the portion where the copper foil is left is stronger than the portion where the copper foil is not left, even if the contact position of the upper and lower pressing members deviates slightly from the cutting line, the copper foil is pressed by the pressure applied by the upper and lower pressing members. The connecting portion can be separated and cut along the end portion of the.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for separating and cutting a flexible printed board sheet according to an embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1A, the flexible printed circuit board 1 of the present embodiment has several connecting parts 2a and 2a.
The flexible printed board sheet 3 is connected by b and 2c, and the circuit pattern is formed within the broken line P. Then, as shown in FIG. 3, an adhesive 5 is formed on the base film 4.
In addition to the circuit pattern on the copper foil 6 pasted with a,
As shown in FIGS. 1 (b), (c) and (d), copper for separation cutting in which an end portion T is located along a separation cutting line (arrow K) near the bases of the connecting portions 2a, 2b, 2c. A pattern is formed by leaving the foil 6a, and the cover film 7 is attached by an adhesive 5b on the copper foil 6 on which the circuit pattern and the copper foil 6a for separating and cutting are formed, as shown in FIG. The substrate sheet 3 is formed.

Then, as shown in FIG. 4, when the flexible printed board 1 is separated and cut at the connecting portions 2a, 2b or 2c, along the separating cutting line K in the vicinity of the base of the connecting portion 2a, 2b or 2c, The upper surface pressing member 8 and the lower surface pressing member 9 are brought into contact with the upper surface and the lower surface of the flexible printed circuit board sheet 3, respectively, and one of the pressing members is fixed,
The other pressing member is pressed from above or below to separate and cut. FIG. 2 shows a flexible printed board 1 separated and cut by the method of this embodiment. Connection part 2a,
Since the copper foil 6a for separating and cutting having the end T located along the separating and cutting line (arrow K) near the bases of 2b and 2c remains, the upper and lower pressing members 8 and 9 and the separating and cutting line (arrow). Even if the relative position of (K) is slightly deviated, the portion of the cover film 7 and the base film 4 in the portion near the end of the copper foil 6a where the copper foil 6a does not remain is cut. This is because the strength of the part where the copper foil 6a is not left is weaker than the strength of the part where the copper foil 6a is left.

[0012]

As is apparent from the above description, according to the method of separating and cutting a flexible printed circuit board sheet of the present invention, there are variations in work when separating and cutting a flexible printed circuit board from one flexible printed circuit board sheet. The flexible printed board sheet can be separated and cut without leaving a connecting portion regardless of variations in the dimensions of the flexible printed board, which is very useful for improving dimensional accuracy and workability of the flexible printed board.

[Brief description of drawings]

1A is a plan view of a flexible printed board sheet used in a method for separating and cutting a flexible printed board sheet according to an embodiment of the present invention. FIG. 1B is an enlarged plan view of a portion A of FIG. 1A. Enlarged plan view of section B (d) Enlarged plan view of section C

FIG. 2 is a plan view of a flexible printed circuit board after separation by a method for separating and cutting a flexible printed circuit board sheet according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view of a flexible printed board sheet used in the method for separating and cutting the flexible printed board sheet.

FIG. 4 is a cross-sectional view showing a state of separating and cutting the flexible printed circuit board sheet by the method of separating and cutting the flexible printed circuit board sheet.

FIG. 5 is a plan view of a flexible printed board sheet used in a conventional method for separating and cutting a flexible printed board sheet.

FIG. 6 is a plan view of the flexible printed circuit board after separation by the method for separating and cutting the flexible printed circuit board sheet.

FIG. 7 is a cross-sectional view showing a state of separating and cutting the flexible printed circuit board sheet by the method of separating and cutting the flexible printed circuit board sheet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flexible printed circuit board 2a, 2b, 2c Connection part 3 Flexible printed circuit board sheet 4 Base film 5a, 5b Adhesive 6 Copper foil 6a Copper foil for separation cutting 7 Cover film 8 Top holding member 9 Bottom holding member K Separation cutting line P Circuit pattern forming part T Edge of copper foil for separation and cutting

Claims (1)

[Claims] 1. A copper foil adhered on a base film with an adhesive, in addition to a circuit pattern, leaving a copper foil for separating and cutting whose ends are located along a separating and cutting line near the base of a connecting portion. The flexible printed circuit board is formed along the separation cutting line of the flexible printed circuit board sheet by forming a pattern, and attaching a cover film with an adhesive on the copper foil on which the circuit pattern and the pattern for separation cutting are formed. In the flexible printed circuit board sheet, the upper surface pressing member and the lower surface pressing member are respectively brought into contact with the upper surface and the lower surface of the sheet, one of the pressing members is fixed, and the other pressing member is pressed from above or below to separate and cut. Separation cutting method.